I agree, it most likely the lights adding the heat not the pumps. My 135 runs much warmer with the MH lights on it than my 50 with just CF light. The 50 needs heaters on to keep the temp up in spite of having all submersed pumps and powerheads. The 135 needs fans to keep the temp down once the lights come on.
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I retired and got a fixed income but it's broke.
Ed
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50 gallon FOWLR, 10 gallon sump.
130 gallon reef, 20 gallon sump, 10 gallon refugium.
10 gallon quarantine.
60 gallon winter tank for pond fish.
300 gallon pond with waterfall.
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